Personally I'd have to say that's bad advise. You should have your weight back but not as far back as possible. It all really depends on the grade of the slope. The steeper the further back. If you have your weight too far back on a turn (I'm assuming that's what your talking about cause that's what the thread is about) they you won't have enough weight on your front wheel causing your to wash out a lot easier.

The best way to judge how far back to have your weight is this:

Try to always have your belly button vertically over your BB. So if your on a slope going down then you should be able to connect a straight line from your belly button to your BB and this line would be perpendicular to a flat/horizontal slope. Hopefully that makes sense if not I'll try to explain it again.